init.sh/init.sh

#!/usr/bin/env bash
# ------------------------------------------------------------------------------
# Init.sh: initialise a computer and conform it
# Copyright (c) 2019-2021 Geoffray Levasseur <fatalerrors@geoffray-levasseur.org>
# ------------------------------------------------------------------------------
# This file is distributed under 3-clause BSD license.
# The complete license agreement can be obtained at:
# https://opensource.org/licenses/BSD-3-Clause
# ------------------------------------------------------------------------------
# Global variables:
#  * INSTALL_MODE: if dev is declared here, packages will be installed one by
#    one instead of sending the whole package list to the package manage
#  * LOGFILE: Define manually output log file name. Can be superseeded through
#    command line parameter. ATTENTION: That variable cannot be set in
#    configuration file as it is treated before loading those, so it must be
#    defined before calling that script.
# ------------------------------------------------------------------------------


# trace ERR through pipes
set -o pipefail

# trace ERR through 'time command' and other functions
set -o errtrace

# set -e : exit the script if any statement returns a non-true return value
# exeption to that will need a special function call
set -o errexit

# set +u: allow undeclared variables because configuration files don't need
# to be complete (even if it's bad practice)
set +o nounset

# We want english messages
export LC_ALL=C
export LANG=C

# Version of init
export VERSION="0.99.7"

# Store script's path
export MYPATH=$(dirname $0)

# Get hostname
export HOSTNAME=$(hostname)

# Load libraries
for lib in $MYPATH/lib/*.sh; do
    . $lib
done

# =============================
# ==== Basic sanity checks ====
# =============================

# Check if a function exists, return 0 if so
function_exists() {
    declare -f -F $1 > /dev/null
    return $?
}

function_exists prnt || (
    echo "*** ERREUR FATALE !"
    echo "*** Il manque des fonctions vitales venant des bibliothèques."
    exit 3
)

# ======================
# ==== Main Program ====
# ======================

# Initializing global variables
export CHECK_ONLY=false
export JUMP=false
export KEEPGOING=false
export RESUME=false
export STAGE_FILE="$MYPATH/stage"

read_commandline $@

# After this we need to be root
# (--help and --version are allowed as unprivileged user)
check_root

# Logfile variable treatment -- cannot be a function

if [[ -n $NEW_LOGFILE ]]; then
    export LOGFILE=$NEW_LOGFILE
else
    export LOGFILE=${LOGFILE:-"$MYPATH/log/init-$(uname -n)-$(stdtime).log"}
fi

prnt I "Création du répertoire d'accueil du fichier log..."
if [[ ! -d $(dirname $LOGFILE) ]]; then
    mkdir -pv $(dirname $LOGFILE)
fi

# Log all outputs to the logfile
exec 3>&1 4>&2
trap 'exec 2>&4 1>&3' 0 1 2 3
exec >  >(tee -a $LOGFILE)
exec 2> >(tee -a $LOGFILE >&2)
prnt I "Démarrage d'init version $VERSION."
prnt I "Le fichier de log est $LOGFILE."

# -- Cannot be a function ends here

load_configuration

process_commandline_and_vars

# Declare proxy system vars if needed and if not already declared
if [[ -n $PROXYSRV && -n $PROXYSRVPORT && -z $NO_PROXY ]]; then
    export http_proxy=${http_proxy:-"http://$PROXYSRV:$PROXYSRVPORT/"}
    export https_proxy=${https_proxy:-"http://$PROXYSRV:$PROXYSRVPORT/"}
fi

# Reinit stage file if no resuming
if [[ $RESUME != true ]]; then
    [[ -f $STAGE_FILE ]] && rm -f $STAGE_FILE
fi

# Loading modules
for mod in $MODULE_LIST; do
    . modules/$mod.sh
done

if [[ $RUN_SHELL == true ]]; then
    prnt I "Lancement d'un shell intéractif..."
    bash -i --rcfile $MYPATH/bash.rc
    prnt I "Sortie du script après exécution du shell."
    exit 0
fi

# Run prechecks
[[ JUMP != true ]] && for mod in $MODULE_LIST; do
    version=VER_$mod
    prnt I "Vérification initiale pour $mod version ${!version}..."
    precheck_$mod
done

# If we only checks, we stop here
if [[ $CHECK_ONLY == true ]]; then
    prnt I "Mode de vérification seulement, on s'arrête là."
    exit 0
fi

if [[ $JUMP == true ]]; then
    prnt W "Les vérification sont évités, attention !"
else
    prnt I "Toutes les vérification ont été faites."
fi
echo

if [[ $KEEPGOING == true ]]; then
    echo -e "${BRed}ATTENTION : Vous avez demandé la poursuite du script en cas d'erreur.${DEFAULTCOL}"
    echo -e "${BRed}ATTENTION : Cette option peut produires des résultats chaotiques.${DEFAULTCOL}"
    echo -e "${BRed}ATTENTION : Cette option ne devrait être utilisé que sur système de test.${DEFAULTCOL}"
    echo
fi
echo -e "${BYellow}Si vous continuez après cette étape le système sera modifié !${DEFAULTCOL}"
echo

while read -r -t 0.001; do :; done # Dump the buffer
read -n 1 -rsp $"Appuyer sur la touche <C> pour continuer ou une autre pour s'arrêter..." key
echo

if [[ $key == "C" || $key == 'c' ]]; then
    # We launch modules one after one
    for mod in $MODULE_LIST; do
        if [[ $RESUME == true ]] && [[ $(grep $mod $STAGE_FILE) ]]; then
            continue
        fi
        # We need this only if JUMP is set but doesn't matter if it's done again
        version=VER_$mod
        prnt I "Application des modifications pour $mod version ${!version}..."
        $mod
        echo $mod >> $STAGE_FILE # Mark as done for resuming function
    done
    echo
else
    echo -e "${Yellow}Le système n'a subit aucune modifications.${DEFAULTCOL}"
    echo
fi

prnt I  "That's all folks !"
rm -f $STAGEFILE